Some basically fix.

* Added extension ".pde" to file, for making relation to OS double-clicking action.
* Fixed file structure to general style of Processing Development Environment.
* Maybe variable "d_radius" too large. Fixed to small number.

* Please fix your repository name to another unique name in the world.
* Please fix fake comments about not-inplemented functions. For example, variables "contrast_value" and "brightness_value" are not related to mouse events.